A mother cat would stimulate the kitten to begin the reflex to relieve her kittens. By doing that, you are doing the right thing. Be patient.
A cat that young can often have socialization issues, so be very affectionate and provide lots of tender loving care. Without a mom cat and litter mates, kittens can develop personality flaws. So, read up on how to care for your cat's mental health. It is important.
I realize you do not want to incur vet bills, but as a pet owner, it is responsible to have your cat neutered or spayed and to get rabies shots when necessary. I learned that the ONLY shot required by law is a rabies shot. Your vet may want to talk you into feline leukemia shots and other shots, but again, the ONLY shot required by law is Rabies. This info helps with your vet bills.